<template>
    <div> <!-- 顶部滑动条区域 -->
    <div id="slider" class="mui-slider ">
        <div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
            <div class="mui-scroll">
                <a :class="['mui-control-item',item.id==0? 'mui-active':'']"
				 v-for="item in cates" :key="item.id" @tap="getPhotoListByCateId(item.id)">
				{{item.title}}</a>
					</div>
				</div>

			</div>
			<!-- 图片列表区域 -->
			<ul class="photo-list">
 			 <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/'+
			  item.id" tag="li">
		    <img v-lazy="item.img_url">
			<div class="info">
				<h1 class="info-title">{{item.title}}</h1>
				<div class="info-body">{{item.zhaiyao}}</div>
			</div>
  			</router-link>
			</ul>
    </div>
</template>

<script>
//1、导入 mui的js文件
import mui from '../../lib/mui/js/mui.min.js'

export default {
    data() {
        return {
			cates:[],//所有分类的列表
			list:[],//图片列表地数组
		}	
		
	},
	created() {
	this.getAllCategory();
	//默认进入界面就主动请求所有图片列表地数据
	this.getPhotoListByCateId(0);	
	},
	mounted() {  //当组件中的dom结构被渲染好，并放到页面中后，会执行钩子函数
					//如果要操作元素最好在mounted里面
					//、初始化滑动控件
			mui('.mui-scroll-wrapper').scroll({
				deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
			});
	},
	methods: {
		getAllCategory(){
			//获取所有图片
			this.$http.get('api/getimgcategory').then(result=>{
				if(result.body.status===0){
					//手动拼接处一个最完整地分类列表
					result.body.message.unshift({title:'全部',id:0});
					this.cates=result.body.message;
				}
			})
		},
		getPhotoListByCateId(cateId){
			//根据分类id获取图片列表
			this.$http.get('api/getimages/'+cateId).then(result=>{
				if(result.body.status===0){
					this.list=result.body.message;
				}
			})
		}
        
    },
}
</script>

<style lang="scss" scoped>
*{
     touch-action:none;
}
.photo-list{
	list-style: none;
		margin: 0;
		padding: 10px;
		padding-bottom:0; 
	li{
		background-color: #cccccc;
		text-align: center;
		margin-bottom:10px; 
		box-shadow: 0 0 9px #999;
		position: relative;
		img{
			width: 100%;
			vertical-align: middle;
		}
			img[lazy=loading] {
				width: 40px;
				height: 300px;
				margin: auto;
			}
		.info{
			color: white;
			text-align: left;
			position: absolute;
			bottom: 0;
			background-color: rgba(0,0,0,0.4);
			max-height: 84px;
			.info-title{font-size: 14px;}
			.info-body{font-size: 13px;}
		}	
	}
}
</style>